Form work for concrete construction



E. 0. KEATOH.

FORM WORK FOR CONCRETE CONSTRUCTION.

APPLICATION men MAR. 6. l9l6.

1 ,1 93,023. Patented Aug. 1, 1916.

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EDWARD O. KEATOR, OF CINCINNATI, OHIO.

FORM WORK FOR CONCRETE CONSTRUCTION.

Specification of Letters Patent.

Patented Aug. 1, 1916.

Application filed March 6, 1916. Serial No. 82,344.

To all whom it may concern:

Be it known that I, EDWARD O. KEA'roR, a citizen of the United States of America, and resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and useful Improvement in Form Work for Concrete Construction, of which the following is a specification.

This invention relates to improvements in form work for concrete construction and particularly for concrete joist and floor construction.

Heretofore in the constructions employed in the formation of monolithic joists and floor slabs, the domed portions located between adjacent joists were formed by laying metal or clay tiles upon a supporting form work, in properly spaced relation to one another, and then in covering these tiles with concrete to fill in the spaces provided for the formation of the joists and to a sufficient depth above the tiles to form the floor slabs. The objection to such constructions has been that the use of metal and clay tiles has necessitated incorporating them as permanent elements of the construction. This not only increases the expense of the structure but also adds to its weight without increasing its strength materially. It is to overcome these objections to concrete construction form work heretofore employed that I have produced my improved form work for concrete construction in which an object is to eliminate the metal and clay tiles of ordinary constructions and to produce a lighter construction without sacrificing any of the strength of the finished structure.

A further object is to produce a form work for concrete oist construction in which the first structure erected thereby will not exceed the cost of ordinary concrete constructions now employed, but which will greatly reduce the cost of subsequent structures erected thereby.

These and other objects are attained in the form work for concrete construction described in the following specification and illustrated in the accompanying drawings, in which;

Figure 1 is a fragmental perspective view of a form work for concrete construction, embodying my invention. Fig. 2 is a sectional View taken on the line 22 of Fig. 1.

The form embodying my invention, consists of a series of sheet metal domes 3 formed by laying a series of thin sheets of metal over a supporting form work consist ng of mats 4 formed of a series of slats 4, oined together by chain or wire cables 4*, the mats being substantially the same as described in United States Letters Patent 1,118,282 granted to Jesse E. Hodges. These mats are laid over and conform to the contour of a series of arched forms 5 secured to stringers 6 extending transversely of the structure, by means of battens 7. These forms 5 are made in two pieces 5 and 5", adapted to be placed in abutting engagement or to be overlapped to make domes of required width and to increase or decrease the distance between adjacent forms. When the sheets of metal are laid over the forms as shown to the right in Fig. 1, the spaces between the domes so formed, are adapted to receive the concrete poured over the temporary structure to form the monolithic joists 8 and floor slabs 9. The stringers are preferably made in two sections 6 and 6 the sections being supported at their outer ends in any suitable manner, overlapped and secured together at their inner ends by spikes, bolts or other suitable fastening devices G and supported by longitudinal supporting planks 10 supported in turn by struts 11 located beneath the stringer sections 6 and 6". The overlapping of the stringers saves material and renders the form work at these points adjustable. The

mats are laid over the forms 5 and down their sides, then along the stringers 6 until the next adjacent form is reached, when the mat is brought upwardly and over this form and onto the next form as shown in the drawings. With such a construction the ends of the mats may be overlapped by interspacing the ends of adjacent mats with one another as shown at 12 in Fig. 1, the forms supporting the interspaced ends being located at intermediate points of the ends so that both mats willbe supported by the same form as shown at 12 in Fig. 1. \Vhen the forms are covered with the mats and the sheets of metal, the ends of the domes 3 so formed are open.

In order to prevent concrete entering the ends of the domes, I have provided forms 13 which are shaped like the forms 5, but whose radii are lengthened by an amount equal to the thickness of slats 1 so that the periphery of the forms 13 is flush with the sheet contacting surfaces of the slats forming the mats 4.

In constructing the form work, the slats of the mats are moved to abut the forms 13 with the sheet contacting surfaces of the slats flush with the edges of the forms 13. This permits of the metal sheets forming the domes 3, to be laid over the mats with their edges engaging the periphery of the end forms 13. The domes thus formed are closed at their ends, but to prevent displace ment of the metal sheets therefrom I preferably secure them at intervals to the edges of the forms 13 by means of nails or other suitable fastening devices 14. This positively holds the sheets in position and pre-.

vents seepage of concrete between the ends 13 and the sheets. In the joist molds I lay the usual reinforcing rods 16*. At the ends of the temporary form work so constructed, I erect sides 15 for forming the beam, girder or wall with which the joists connect, when the concrete is poured into the space between the ends 13 and siding 15 as shown at 16 in Fig. 1, and along the lengths of the domes 3 at the edge of the structure, I preferably erect siding 17 to retain the concrete poured over the structure, in the same manner that the siding 15 supports the concrete as shown at 16 in Fig. 1. The top edges of the sidings 15 and 17 extend above the domes 3 a distance equal to the thickness of the floor slab in order that the concrete may be poured over them to a depth suflicient to produce floor slabs of proper thickness as shown in Fig. 1. At those edges of the framework, which extend parallel with the domes 3 and siding 17, I erect an inner side 18, the top edge of which is flush with the top surfaces of the slats 4 of the mats 4. Against the inner side of the siding 18 I erect forms 5, the members of which are adjustable in the same manner as the other forms 5, but which are provided with one member 5 which is rectangular in shape and which supports the mat slats as shown in Fig. 1. The metal sheets are then laid over the mats at this point and their edges are tacked to the top edge of the siding 18. Thus the outer longi tudinal edge of the outer floor slab is brought into the side of the girder or wall at the edge of the structure. At the outer ends of the slats of the mats covering the forms 5 are located end forms 13 which like the other forms 13 are composed of two relatively adjustable members, one of which is however, given a rectangular shape as shown at 13 in order to close the end which would be left open by this construction. The edges of the sheets are tacked to the edges of the forms 13 as well as to the edge of the siding 18 to prevent the concrete seeping beneath the sheets.

In dismantling the temporary form work embodying my invention it is but necessary to remove the struts 11, the planks 10, and

the stringers 6 carrying the forms 5, in order that the mats may be-removed. After the mats are removed the metal sheets 3 may be readily drawn away from the concrete. Thus with a construction embodying my invention the joists and the floor slabs are formed integrally and the elements employed in their formation may be used time after time before their renewal is required. This as previously set forth is a material advantage over previous constructions employing metal domes which are designed to be permanently incorporated in the finished structure, as well as in those structures employing hollow clay tiles which are also intended for permanent location therein.

Having thus described my invention, what I claim is;

1. In a temporary form work for concrete joist and floor slab construction the combination of a series of extensible stringers extending from side to side of the structure to be formed, forms mounted on the stringers in spaced relation to one another and adjustable to form floor slabs of varying widths and joists of varying thickness, flexible mats supported by the forms, and flexible sheets covering the mats and adapted to receive concrete.

2. In combination in a temporary form work for concrete joist and floor slab construction a series of forms, means for supporting the forms in spaced relation to one another to form floor slabs and joists between them, said forms being adjustable to form floor slabs of varying width and joists of varying width, flexible mats covering the forms and extending into the spaces between the forms, and sheets covering the mats adapted to be covered with concrete.

3. A temporary form work for concrete joist and floor slab construction comprising a series of forms, means for supporting the forms in spaced relation to one another, said forms consisting of adjustable members adapted to be collapsed or extended with relation to one another to increase or decrease the width of the space between adjacent forms and to increase or decrease the width of the forms, a series of flexible mats supported by the forms, and a series of flexible sheets covering the mats adapted to receive concrete thereon, the adjustability of the forms increasing and decreasing the width of the floor slabs and the thickness of the joists formed thereby.

4. In a temporary form work for concrete joist and floor slab construction the combination of a series of forms spaced apart, a series of mats supported by the forms and occupying the spaces between them, sheets covering the mats and end forms abutting the ends of the mats and adapted to close the openings left by the ends of the mats at the points they cover the first mentioned forms.

5. In combination in a temporary form Work for concrete joist and floor slab construction, a series of flexible mats, forms supporting the mats at intervals to form elevations and depressions therein, sheets covering the mats and contacting the elevated and depressed portions thereof, and end forms abutting the ends of the mats at the elevated portions thereof to close the openings formed thereby.

6. A temporary form work for concrete joist and floor slab construction comprising a series of forms located in spaced relation to one another, a series of flexible mats covering the forms to form a series of longitudinally extending domed elevations With spaces between them, sheets covering the mats, and a siding surrounding the forms, mats and sheets, said siding being located in spaced relation therewith, and extending abm'e the highest point thereof to retain concrete in the depressions and upon the domes to form floor slabs with joists between them.

In tcstimony whereof, I have hereunto subscribed my name this 29th day of February, 1916.

EDWVARD O. KEATOR.

Vitnesses \VALTER F. MURRAY, \V. THORNTON BOGERT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

